AU2013373963B2 - Thick plate type joint lock for ladder connection - Google Patents

Thick plate type joint lock for ladder connection Download PDF

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Publication number
AU2013373963B2
AU2013373963B2 AU2013373963A AU2013373963A AU2013373963B2 AU 2013373963 B2 AU2013373963 B2 AU 2013373963B2 AU 2013373963 A AU2013373963 A AU 2013373963A AU 2013373963 A AU2013373963 A AU 2013373963A AU 2013373963 B2 AU2013373963 B2 AU 2013373963B2
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AU
Australia
Prior art keywords
plate
thick
ladder
slot
stub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
AU2013373963A
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AU2013373963A1 (en
Inventor
Xiaochun MIAO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SUZHOU DONGRUN LADDER Co Ltd
Original Assignee
SUZHOU DONGRUN LADDER CO Ltd
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Publication of AU2013373963A1 publication Critical patent/AU2013373963A1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/50—Joints or other connecting parts
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
    • E05D11/00—Additional features or accessories of hinges
    • E05D11/06—Devices for limiting the opening movement of hinges
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
    • E05D11/00—Additional features or accessories of hinges
    • E05D11/10—Devices for preventing movement between relatively-movable hinge parts
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
    • E05D11/00—Additional features or accessories of hinges
    • E05D11/10—Devices for preventing movement between relatively-movable hinge parts
    • E05D11/1007—Devices for preventing movement between relatively-movable hinge parts with positive locking
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/32—Ladders with a strut which is formed as a ladder and can be secured in line with the ladder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/10—Arrangements for locking

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ladders (AREA)

Abstract

A thick plate type joint lock for ladder connection comprises an inner plate (21) and an outer plate (22) connected in a relatively rotating way, and a positioning shaft sleeve (23) for locking the inner plate (21) and the outer plate (22). In addition, a rotation limiting column (26) is arranged on the outer plate (22), and a groove (27) for resisting the limiting column (26) is arranged on the inner plate (21). The limiting column (26) and the groove (27) restrict rotation of the inner plate (21) relative to the outer plate (22), thus improving a load bearing capability and security of a ladder.

Description

T HICK-PLATE. HINGE FOR LADDER JOIN N' G The present invention relates to a structure member for ladder jointing. in particular to a thick-plate hinge for ladder joi ntng. In 1970s, an American ala Vag designed and nanufactured a telescopic multi-purpose ladder, which was S conmonly known as "Litte Giant Through yeas of development, Little Giant ladders have taken the lead the industry and are popular around the worl' A key tehnique of Little Giant ladders is the joming par called thick plate hinge that joints the upper adder setiand a lower ladder sect Ple F ase see Fig ' -4. The thick-plate hinge 10 comprises an inner plate II and outer plates 12 tha are fided on ouer side of the inner plate, te inner plae I 1 and outer 10 plate 12 are relatively rotatable; the thick-plate hinge 0 further cornprises a positioning shaPt sleeve 13 designed to lock Lup and position the inner plate 11 and outer plates i 2- wherin te positioning haft sleeve 13 has a shaft 14 and a lock pin 157 the outer plate 12 hIs a stop stb 16 fixed on it, and the '-op stu1b 16 butts against an outer are surface I 10 of the inner plate I i when the relative rotation angle between the inner plate I i and the outer plate 12 reaches 180. The stop stub 16 can improves the bearing performance 15 of the thick-pIate hinge 10 Via the positioning shaf sleeve 13, the inner pate i l and outer plate 12 of the thick-pate hinge 10 can he locked up when they rotate to . a preset angle in relation to each other for xaple, the inner plate I I and oau plates 12 can be locked up via the positoning shaf sleeve I 3 when the unfolding angle is 0 '36" or 18W. With the structure dried abovec two t Uhick-plate hinge 10 can beont between an upper 20 ladder section and a lower ladder section, so that the ladder can be trnsformd intro a doublesidd ladder with ') unflding angle) or a ong straight ladder (with 180unto'odang angle) to attain nudnple purposes When the ladder is transtbned into a straight ladder, both the inner plate and the outer plate of the two thick-plate hinges are unIfoled to 180. When used in unexpected or ested under specific conditions, e.g. tested as per the ladder standards oflUSA or that of A ustralia, tie fested ladder must he able to hear the test 25 load in a case that either thick-plate hinge work in faI state (tha lock pin 1 is drawn out of the lock pin hole)n the prior art, in case either thickAlate hinge in fail state though he' thick-plate hinge still has soume bearing capability obtained from the butig of the stop stub 16 and outer plate 12. the stop stub would nave displacement on the outer are surface, snrce the bearing surface of the inner plale that butts against the stop stub is ae surface: conseqrienitins the bearing angle between the upper ladder section and the lower ladder 3n section greater than 1804; in addition, the higher the load is the greater the displacement would be, and it lead to larger relative rotation angle between the imer plate and the outer plate. As a result, the overall bearing. capacity of the ladder would be degrade, and the entire ladder is more possible to fail in the testL In iI'ge~ol'O' eNIRF'ribDCCGW~44it I doev241i921 I 2 that case, the solution in the prior art is to increase the strength of the thick-plate hinge or the strength of the entire ladder to improve the bearing capacity of the entire Iadder, which would inevitably increase the cost of the entire ladder severely. To overcome the drawbacks in the prior art, embodiments of the present invention provide a new thick-plate 5 hinge, which has better bearing performance and is safer and more reliable. The invention provides a thick-plate hinge for ladderjointing, comprising an inner plate and a pair of outer plates that are rotatably connected to each other, the thick-plate hinge further comprising a positioning shaft sleeve designed to lock up and position the inner plate and outer plates, wherein the positioning shaft sleeve is provided with a locking pin, a stop stub is fixed to the pair of outer plates and is operable to limit the 10 relative rotation angle of the inner plate, and the inner plate is provided with a slot for stopping the stop stub, the configuration being such that the stop stub will enter into the slot when the inner plate and outer plates are rotated and unfolded in relation to each other, and the stop stub will exit from the slot when the inner plate and outer plates are rotated in a folding direction in relation to each other. Preferably, the stop stub is a cylindrical stub, the bottom surface of the slot is an inwardly concaved arc 15 surface, and the arc surface is tangentially fit the outer circumferential surface of the stop stub. More preferably, the radius of the arc surface is greater than or equal to the radius of the stop stub. Preferably, the depth of the slot is greater than or equal to the radius of the stop stub. By providing the slot on the inner plate. the slot can limit the displacement of the stop stub when the relative rotation angle between the inner plate and the outer plate reaches to 1800; thus, the thick-plate hinge has 20 better bearing performance, and is safer and more reliable. The present invention will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which: Fig.l is a front view of a thick-plate hinge for ladder jointing in the prior art, with the thick-plate hinge unfolded to 360; 25 Fig.2 is a rear view of the thick-plate hinge for ladder jointing in the prior art, with the thick-plate hinge unfolded to 36"; Fig.3 is a left view of the thick-plate hinge for ladder jointing in the prior art, with the thick-plate hinge unfolded to 360; Fig.4 is a front view of the thick-plate hinge for ladderjointing in the prior art, with the thick-plate hinge unfolded to ISO'* 1i. is a front view of th o-ate hige for adder jointing provided in embodiments of the preseni inventim with the thick hie inge unfolded to 36 Fig 6 is an enlarged view of porton A of the thck-plate hinge shown in Fig.3; 5 Fig is a rear view of th thick-plate hinge -for ladder jointing provided in embodiments of ti present inventim with the thicik-platIe unfolded to 36 Fig 8 is a front view of the thick-plate ingc for Iadider jointing provided in embodiments of the present inventuon with the thickplit hinge infoldd to 180*; Fia is a schematic diagram of a ladder mounted with he thick-plate hinge for ladderjointing provided in 10 embodiments of the present invention in performance test with the thick-plate hinge untolded to 180*. Theeinathe, a prefred embodineat of the present invention will be described in detaiL with reference to the accompanying drawings. Please see Fig.5- fanbodinets of the present invention provide a tick-plate hinge 20 for ladder jointing, comprising an inner plate 21 and outer plates 22 that are folded on both outer sides of the Ain pt tile 15 inner plate 21 and outer plate 22 are relatively rotatabse; the i-plate joint lock 20 ther comprises a positioning shaft sleeve 23 designed to lock up and position the irmer plate 21 and outer plates 22 the postioiig shaft sleee 23 is provided with a shaft 24 and a I leek pin2 the iutr pt22 has a stop stub 26 lixed on it, and the inner plate 21 has a slot 27 that limits the doispacement of the stop stub 26. Please see fig,8 The stop stub 26 will enter into the slot 27 entirely when the relative rotation angle 20 between the inner plate 21 and the outer plate 22 reaches 180" in this embodiment, the stop stub 26 is a cyindrical stub, the bottom surface of the slot 27 is an inwardly concaved arc surface, the outer circunferential surface of the stop stub 26 is targentially fit ar surfce o .. Oflthe S.rn.,n~ tINe I ot thui-0n the slot a d R of the s e of the slot 27 is greater than thc radius of the stop stul) 26. The depth F! of the sli 2 is greater than the radius of the stop stub 26 25 Please see 'Fg, Two thickv-pate. hinges 20 can be connected between an upper ladder section 31 ard a lower ladder section 32 so that the ladder Can be transformed into a double-sided ladder (with 360unfoldig angle) or a long straight ladder (with 1800 unfolking angle), to attain iltiple purposes. When a ladder 30 nlounted with the thick-pite hinges 20 proved in embodimets of the present invention is unifilded to 180" and tested in single joint lock test'. the ladder is obliquely supported on vertical wall 40 at a certain angle and then one thick-plate hinge 20 is manipuated to fail stale (the iock pin 2$ is drawn out ofthe lock hole); in that case, the fu.neion tf hinge is still albe to assistthe another thick-plateig effecively to bear he. heavy load 50 hung on the upper Section 31 ofthe tested ladder.since the stop stub 26 of the failed hinge enters into the slot 27. 5 Corpared to the pnior art, the ladder 30 that employs the thick-plate hinge 20 provided in embotdments Wf the present invention Wll not be unfolded to an angie greater than 180"; therefore, the ladder has great mproved bearingprtforane and i sater and more reliable. The above embodimrients are provided ory to eia-borate the technical idea and features of the present invention so that thoCse skied in te art can understand the present invention and implement accordingly, 10 instead of constituting any hmitation to the scope of protection of the present invention. Any equivalent modification or embelfishment made on the basis of the substantial spirit of the present spirit shall be deemed as failing into the scope of protection of the present invention. Throughout this specifcaton and the clims which follow, unless. the context requires otherwise, the word "comprisetand variations sucI as ises" and composingg. will he understood to imply the inchision t5 of a stated integer or step or group~ integers or steps but not the exclusion of any other integer or step or group of inteters or steps. The reference in this speciticatio to any pior publication (or information derived from it) or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any torn of suggestior that that prior publication (or intfrmation derived fron it) or known matter torms part of the 20 common general knowledge n Mhe field of endeavour to wich this specification reates,

Claims (6)

1. A thick-plate hinge for ladderjointing, comprising an inner plate and a pair of outer plates that are rotatably connected to each other, the thick-plate hinge further comprising a positioning shaft sleeve designed to lock up and position the inner plate and outer plates, wherein the positioning shaft sleeve is 5 provided with a locking pin, a stop stub is fixed to the pair of outer plates and is operable to limit the relative rotation angle of the inner plate, and the inner plate is provided with a slot for stopping the stop stub, the configuration being such that the stop stub will enter into the slot when the inner plate and outer plates are rotated and unfolded in relation to each other, and the stop stub will exit from the slot when the inner plate and outer plates are rotated in a folding direction in relation to each other. 10
2. The thick-plate hinge for ladder jointing according to claim 1, wherein the stop stub is a column stub and the slot is an inwardly slot.
3. The thick-plate hinge for ladderjointing according to claim 2, wherein the stop stub is a cylindrical stub and the slot is an inwardly concaved are slot.
4. The thick-plate hinge for ladder jointing according to claim 3, wherein the radius of the are slot is 15 greater than or equal to the radius of the stop stub.
5. The thick-plate hinge for ladder jointing according to claim 3, wherein the depth of the slot is greater than or equal to the radius of the stop stub.
6. The thick-plate hinge for ladder jointing according to any of claims 1 to 5. wherein the stop stub will enter into the slot partially or entirely when the relative rotation angle between the inner plate and the 20 outer plates reaches 180*.
AU2013373963A 2013-01-18 2013-09-18 Thick plate type joint lock for ladder connection Active AU2013373963B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN201320026646.8 2013-01-18
CN2013200266468U CN203081279U (en) 2013-01-18 2013-01-18 Thick plate type joint lock for ladder connection
PCT/CN2013/083712 WO2014110913A1 (en) 2013-01-18 2013-09-18 Thick plate type joint lock for ladder connection

Publications (2)

Publication Number Publication Date
AU2013373963A1 AU2013373963A1 (en) 2014-08-28
AU2013373963B2 true AU2013373963B2 (en) 2016-01-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
AU2013373963A Active AU2013373963B2 (en) 2013-01-18 2013-09-18 Thick plate type joint lock for ladder connection

Country Status (4)

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US (2) US20150315844A1 (en)
CN (1) CN203081279U (en)
AU (1) AU2013373963B2 (en)
WO (1) WO2014110913A1 (en)

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US8225906B2 (en) 2008-08-22 2012-07-24 Core Distribution, Inc. Extendable/retractable ladder
CN203081279U (en) 2013-01-18 2013-07-24 苗晓春 Thick plate type joint lock for ladder connection
US10233692B2 (en) * 2014-12-02 2019-03-19 Core Distribution, Inc. Foldable ladder
US9416591B2 (en) 2014-12-02 2016-08-16 Core Distribution, Inc. Telescoping ladder with stabilizers
US9580959B2 (en) * 2014-12-02 2017-02-28 Core Distribution, Inc. Foldable ladder
CN109154172B (en) * 2016-06-14 2021-03-09 伟英企业有限公司 Ladders, ladder hinges, and related methods
US20180274296A1 (en) * 2017-03-21 2018-09-27 Tricam Industries, Inc. Adjustable hinge for a multi-position ladder
CN107178303A (en) * 2017-03-03 2017-09-19 厦门新技术集成有限公司 The double ladder that a kind of convertible vertical ladder is used
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WO2019094329A1 (en) 2017-11-08 2019-05-16 Core Distribution, Inc. Locking assembly for a telescoping ladder
USD935055S1 (en) * 2019-08-07 2021-11-02 Tricam Industries, Inc. Hinge for a multi-position ladder
US11795760B2 (en) * 2019-10-24 2023-10-24 Core Distribution, Inc. Ladder tripod assembly and system
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US20230383601A1 (en) * 2022-05-27 2023-11-30 Little Giant Ladder Systems, Llc Multifunction button for ladder adjustment
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Also Published As

Publication number Publication date
CN203081279U (en) 2013-07-24
WO2014110913A1 (en) 2014-07-24
US20170204663A1 (en) 2017-07-20
US20150315844A1 (en) 2015-11-05
US10487580B2 (en) 2019-11-26
AU2013373963A1 (en) 2014-08-28

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